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Question1 answer1,144 followingPosted 18 Apr 2025, 15:30 UTC96.2K views3,975 votes

limit_req burst smoothing or limit_conn hard cap for protecting an upstream during traffic spikes

I have an nginx reverse proxy in front of an application that serves large, expensive dataset queries. Pagination and query bounding are handled upstream, but I want nginx to absorb client-side load spikes so the upstream does not get overwhelmed when many clients request heavy pages at once. Two documented mechanisms seem relevant: limit_req with a zone, ra

Community & Careers · Editorial question

Community & Careers

Question0 answers1,051 followingPosted 07 Jan 2024, 17:32 UTC97.3K views1,336 votes

limit_req_zone: per‑location burst limits and interaction with limit_conn

Goal To understand how nginx applies burst limits on a per‑location basis when using limit_req_zone and how these limits interact with limit_conn when both directives are enabled on the same location. Constraints & Uncertainty The limit_req_zone directive defines a shared memory zone and a global rate; it does not expose a burst parameter inside the zone

Community & Careers · Editorial question

nginx limit-conn configuration